Cell Phone Privacy

I believe police officers need a warrant to search someones phone in an investigation. I say this because a persons phone is something that is paid either by them, or someone else. If police officers just went through peoples phones with an unprovable cause, they might find things that the owner of the phone might not want others to see. If people are worried about the phone information being deleted or evidence that is "remote wiping" as the article states. They should have the right to confiscate the phone and wait for a warrant. I say this because in the Riley vs. California case they could have found out he was involved in a shooting if they took the proper precautions, rather than go against the 14th amendment and his conviction gets overturned. My last example of why they need a warrant has to due with the United States vs. Jones case. The US violated the rights of the people and places a GPS tracking device on his car without a warrant. This is not the correct way to go about finding someone and bringing them to justice, you can accomplish the same goal by taking the correct, and most legal way.